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8N Hydraulic Lift Bug

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LumbrJaq NNY

08-21-2006 06:20:22

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Totally cleaned out center housing & belly pump.
Polished up cam and replaced cam pin.
Adjusted according to manual instructions.
Replaced hyd. cylinder, installed NAA style piston w/o-ring, leather backup washer.
New oil.

In position control lift raises/lowers just fine without a load on.
When lifting with a load, the drawbar just keeps rising even though I've stopped motion with the touch control lever.
I have to drop the touch control lever all the way down to get her to stop upward motion.
Then, Bam!, she drops all the way down.
It's dangerous, unusable.
So I've been using my 2-cylinder, air cooled, fuel efficient diesel, USSR made Belarus.

What might be the problem with this system?

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Indy Clark

09-02-2006 12:55:54

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 Re: 8N Hydraulic Lift Bug in reply to LumbrJaq NNY, 08-21-2006 06:20:22  
I have a similiar problem with the Hydraulics on an 8N.

I do have one of those "LIVE THANG"s (it sure is cool - best investment I've made!!! The second best was stablizing bars.)

I've got the right hand inspection plate off and I've gotten inside and have started to figure out left from right - exhaust and intake - I replaced the Hydraulic fluid after I decided I couldn't see enough - and as soon as I restarted the fuild became a froth, just like a coke that is shaken. The source is bubbling from the exhaust side. Is this to be expected?

I still need to test the safety value too - I just wanted to send this now.

In my case I noticed that using just the THANG wasn't enough to raise the lift - If I engage the PTO then it will raise - since I was standing on it to give it some weight I noticed that it was shaking or hammering - when I bounced on it this was more pronounced. I didn't notice any difference in sound but I admit I wasn't thinking to listen for it either.

Thanks for your thoughts!


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Indy Clark

09-02-2006 13:16:35

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 Re: 8N Hydraulic Lift Bug in reply to Indy Clark, 09-02-2006 12:55:54  
More - Diagnostics...

I figured out that the froth from the exhuast is when the height is reached - I don"t see to have anything escaping from the safety.

When I let the lift go to the bottom and then start to the top with only the LIVE THANG it will start to go up - If I stop it - by simply pressing down with my hand on the lift arm - then I don"t see any froth from the exhaust and I don"t see any dripping from above yet there is no strength to lift - If I let go then it will proceed up.

Does this help any? Any other idea?

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Indy Clark

09-02-2006 14:00:03

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 Re: 8N Hydraulic Lift Bug in reply to Indy Clark, 09-02-2006 13:16:35  
Problem located - I think...

So I finally got down low enough and looked back into the upper part - A major flow of fluid is coming from the front side of the Ram Cylinder - almost 3/16-1/4 inch at least of running fluid.

Is there anything else to inspect before I take the lift cover off?

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08-21-2006 07:02:27

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 Re: 8N Hydraulic Lift Bug in reply to LumbrJaq NNY, 08-21-2006 06:20:22  
Sounds like control valve is sticking. Pull the dipstick side cover plate.. and watcht he control arm in the pump valve linkage and see if it "isn't" moving freely.


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